7213865 has 8 divisors (see below), whose sum is σ = 9165960. Its totient is φ = 5431552.

The previous prime is 7213861. The next prime is 7213897. The reversal of 7213865 is 5683127.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2920681 + 4293184 = 1709^2 + 2072^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7213865 - 2² = 7213861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7213861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42350 + ... + 42519.

It is an arithmetic number, because the mean of its divisors is an integer number (1145745).

Almost surely, 2^7213865 is an apocalyptic number.

It is an amenable number.

7213865 is a deficient number, since it is larger than the sum of its proper divisors (1952095).

7213865 is a wasteful number, since it uses less digits than its factorization.

7213865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84891.

The product of its digits is 10080, while the sum is 32.

The square root of 7213865 is about 2685.8639206036. The cubic root of 7213865 is about 193.2217466130.

The spelling of 7213865 in words is "seven million, two hundred thirteen thousand, eight hundred sixty-five".